Тип публикации: статья из журнала (материалы конференций, опубликованные в журналах)
Конференция: International Conference on Magnetism (ICM 2006); Kyoto, JAPAN; Kyoto, JAPAN
Год издания: 2007
Идентификатор DOI: 10.1016/j.jmmm.2006.10.575
Ключевые слова: strong electron correlations; electronic structure; multiband p-d model
Аннотация: A multiband p - d model describes electronic properties of cuprates in the large energy scale similar to U similar to 10 eV. In the strong electron correlation ( SEC) limit we project out double occupied intra- atomic states and obtain the singlet - triplet t - t' - t'' - J(*) model at scale similar to Omega approximate to 0. 5 eV,Показать полностьюwhere Omega is the excitation energy between two- hole singlet and triplet states. At smaller energies similar to J one gets the usual t - t' - t'' - J(*) model. At energies similar to omega(D) one has to add electron - phonon interaction, and the low- energy effective Hamiltonian with magnetic and phonon mechanisms of pairing is constructed in SEC limit with parameters calculated from the ab initio approach. Magnetic mechanism of pairing results in a very high value of the critical temperature T-c while electron - phonon interaction suppresses d- pairing to the T-c similar to 100 K. (c) 2006 Elsevier B. V. All rights reserved.
Журнал: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Выпуск журнала: Vol. 310, Is. 2, Part1
Номера страниц: 93-95
ISSN журнала: 03048853
Место издания: AMSTERDAM
Издатель: ELSEVIER SCIENCE BV